EP2450631A1 - Heating cooking appliance - Google Patents

Heating cooking appliance Download PDF

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Publication number
EP2450631A1
EP2450631A1 EP10794222A EP10794222A EP2450631A1 EP 2450631 A1 EP2450631 A1 EP 2450631A1 EP 10794222 A EP10794222 A EP 10794222A EP 10794222 A EP10794222 A EP 10794222A EP 2450631 A1 EP2450631 A1 EP 2450631A1
Authority
EP
European Patent Office
Prior art keywords
heating
heating device
path
gas
circulation duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10794222A
Other languages
German (de)
French (fr)
Other versions
EP2450631A4 (en
Inventor
Yasuhiko Kamii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of EP2450631A1 publication Critical patent/EP2450631A1/en
Publication of EP2450631A4 publication Critical patent/EP2450631A4/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated

Definitions

  • the present invention relates to a heating cooking appliance that circulates a gas in a heating chamber to perform heating cooking.
  • FIG. 7 is a side sectional view showing a conventional heating cooking appliance.
  • a heating cooking appliance 1 includes a heating chamber 2 that houses an ingredient to be cooked which is placed through a front side when a door 3 is opened.
  • An inlet port 2a opens through a rear side of the heating chamber 2, and an outlet port 2b opens through a ceiling side.
  • the inlet port 2a and the outlet port 2b are connected to each other by a circulation duct 20 that is disposed around the heating chamber 2.
  • An air blower 31 facing the inlet port 2a is disposed in a rear portion 21 of the circulation duct 20, and a heating device 32 is disposed in a ceiling portion 22 of the circulation duct 20.
  • air in the heating chamber 2 flows into the circulation duct 20 from the inlet port 2a as indicted by an arrow A1.
  • the air flowing into the circulation duct 20 is guided from the rear side to the ceiling portion 22 as indicated by an arrow A2 and raised in temperature by the heating device 32.
  • the air raised in temperature by the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by an arrow A3.
  • the air in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the air output from the outlet port 2b into the heating chamber and radiant heat from the heating device 32.
  • PLT1 JP-A-2009-2627 (page 3 to page 10, Fig. 2 )
  • the air is supplied to the ceiling portion 22 of the circulation duct 20 from the rear side that is an upstream side with respect to the heating device 32.
  • an upstream portion of the heating device 32 is easily cooled but a downstream portion of the heating device 32 is only slightly cooled, so that the downstream portion becomes higher than the upstream portion in surface temperature.
  • the surface temperature of the downstream portion of the heating device 32 is raised to a high temperature; and the life of the heating device 32 becomes short.
  • electric power supplied to the heating device 32 is restricted by the surface temperature of the downstream portion, there is a problem that the cooking time becomes long.
  • the same problem occurs in a heating cooking appliance as well that performs cooking by supplying steam to the heating chamber 2 and maintaining the steam at a predetermined temperature by means of the heating device 32.
  • a heating cooking appliance includes:
  • the gas including air and steam in the heating chamber flows into the circulation duct via the inlet port.
  • the gas flowing into the circulation duct branches off into the first and second paths and is guided to the heating device disposed over the heating chamber.
  • the second path guides the gas to the downstream portion of the heating device
  • the first path guides the gas to the upstream portion of the heating device to allow the gas to join the gas flowing in the second path at the downstream portion of the heating device.
  • the gas flowing in the first and second paths is raised in temperature by the heating device and output from the outlet port into the heating chamber. According to this, the gas in the heating chamber circulates via the circulation duct and the ingredient is cooked by the gas raised in temperature by the heating device and radiant heat from the heating device.
  • the second path is disposed over the first path via a partition plate.
  • the gas flowing in the circulation duct is branched vertically by the partition plate and joins at the downstream portion of the heating device.
  • the partition plate is provided with a small hole that faces a predetermined position of an upstream portion of the first path. According to this structure, part of the gas flowing in the second path flows into the first path via the small hole.
  • the small hole is formed right over or substantially right over the heating device.
  • the heating cooking appliance having the above structure according to the present invention is provided with a guide plate that blocks a flow path for the gas flowing in the second path and guides the gas to the small hole.
  • a heating cooking appliance according to the present invention includes:
  • the gas including the air and steam in the heating chamber flows into the circulation duct via the inlet port.
  • the gas flowing into the circulation duct is branched off into the first and second paths by the partition plate; and the gas flowing in the first path is raised in temperature by the heating device disposed in the first path.
  • the gas flowing in the second path is supplied to a predetermined position of the first path via the small hole, and raised in temperature by the heating device.
  • the gas raised in temperature by the heating device is output from the outlet port into the heating chamber. According to this, the gas in the heating chamber circulates via the circulation duct, and the ingredient is heated and cooked by the gas raised in temperature by the heating device and the radiant heat from the heating device.
  • the small hole is formed right over or substantially right over the heating device.
  • the heating cooking appliance having the above structure according to the present invention is provided with a guide plate that blocks a flow path for the gas flowing in the second path and guides the gas to the small hole.
  • the circulation duct branches off into: the first path that guides the gas to the upstream portion of the heating deice; and the second path that guides the gas to the downstream portion of the heating device and joins the first path, so that it is possible to evenly cool the heating device from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device. Besides, it is possible to increase electric power supplied to the heating device and shorten the cooking time.
  • the circulation duct braches off into: the first path that is provided with the heating device; and the second path that is provided with the small hole which faces the first path, so that the gas is suppliable from the second path via the small hole to a portion of the first path which is locally raised to a high temperature by the heating device. According to this, it is possible to evenly cool the heating device from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device. Besides, it is possible to increase electric power supplied to the heating device and shorten the cooking time.
  • Fig. 1 is a side sectional view showing a heating cooking appliance according to a first embodiment.
  • the heating cooking appliance 1 includes the heating chamber 2 that houses an ingredient to be cooked which is placed through the front side when the door 3 is opened.
  • the inlet port 2a is opened through the rear side of the heating chamber 2, and the outlet port 2b is opened through the ceiling surface of the heating chamber 2.
  • the inlet port 2a and the outlet port 2b are connected to each other by the circulation duct 20 that is disposed around the heating chamber 2.
  • the air blower 31 facing the inlet port 2a is disposed in the rear portion 21 of the circulation duct 20.
  • the ceiling portion 22 of the circulation duct 20 is divided by a partition plate 25 into a lower first path 23 and an upper second path 24.
  • the heating device 32 is disposed in the first path 23.
  • Fig. 2 shows a plan view of the ceiling portion 22 of the circulation duct 20.
  • an upper portion is a rear side of the heating cooking appliance 1.
  • the heating device 32 is formed of a tube-like sheathed heater that is supplied with electricity from a side and snakes its way.
  • the partition plate 25 is formed of stainless steel or the like, covers an upstream portion of the heating device 32 and separates the first and second paths from each other.
  • a downstream portion of the heating device 32 is covered by an upper plate 22a of the ceiling portion 22, and an opening portion 23a is formed in a horizontal direction between the upper plate 22a and the partition plate 25.
  • the first path 23 and the second path 24 join each other via the opening portion 23a.
  • air in the heating chamber 2 flows into the circulation duct 20 from the inlet port 2a as indicted by the arrow A1.
  • the air flowing into the circulation duct 20 is guided from the rear side to the ceiling portion 22 as indicated by the arrow A2 and branched by the partition plate 25 into the first and second paths 23, 24.
  • the air flowing in the first path 23 travels from the upstream portion of the heating device 32 to the downstream portion of the heating device 32.
  • the air flowing in the second path 24, as indicated by an arrow A22 joins the first path 23 via the opening portion 23a and is guided to the downstream portion of the heating device 32.
  • the air raised in temperature by contact with the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by the arrow A3. According to this, the air in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the air, which is output from the outlet port 2b into the heating chamber 2, and the radiant heat from the heating device 32.
  • the ceiling portion 22 of the circulation duct 20 branches off into: the first path 23 that guides the air to the upstream portion of the heating deice 32; and the second path 24 that guides a gas to the downstream portion of the heating device 32 and joins the first path 23, so that it is possible to evenly cool the heating device 32 from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device 32 is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device 32. Besides, it is possible to increase electric power supplied to the heating device 32 and shorten the cooking time.
  • the second path 24 is disposed over the first path 23 via the partition plate 25, so that it is possible to easily branch the circulation duct 20. Besides, it is possible to secure a larger flow-path area of the second path 24 than disposing the first and second paths 23, 24 in a front-rear direction, so that it is possible to surely cool the downstream portion of the heating device 32.
  • the partition plate 25 may be provided with a small hole 25a that has an opening area smaller than the opening portion 23a and faces a predetermined position of the upstream portion of the first path 23.
  • the small hole 25a as shown in the figure, is disposed, for example, at both end portions on the flow-in side of the second path 24. Part of the air flowing in the second path 24 flows into the first path 23 via the small hole 25a. According to this, it is possible to supply air from the second path 24 via the small hole 25 to a portion into which the air in the first path 23 only slightly spreads and to more evenly cool the upstream portion of the heating device 32.
  • the partition plate 25 is provided with a guide plate 25b that guides the air to the small hole 25, it is possible to surely supply the air from the small hole 23 to the first path 23, which is more desirable.
  • the small hole 25a may be disposed right over or substantially right over the tube-like heating device 32 that snakes. According to this, the air, which is supplied from the small hole 25a, is able to directly touches the heating device 32, whose surface temperature rises, to cool the heating device 32.
  • Fig. 4 shows a side sectional view of a heating cooking appliance according to a second embodiment.
  • the present embodiment is different from the first embodiment in structure of the partition plate 25 of the ceiling portion 22 of the circulation duct 20.
  • the other portions are the same as the first embodiment.
  • Fig. 5 shows a plan view of the ceiling portion 22 of the circulation duct 20.
  • the partition plate 25 covers the entire surface of the first path 23 and is provided with a plurality of the small holes 25a that face the first path 23.
  • the small hole 25a is disposed right over or substantially right over the tube-like heating device 32.
  • the air which flows from the heating chamber 2 into the circulation duct 20 via the inlet port 2a as indicted by the arrow A1, is guided from the rear side to the ceiling portion 22 as indicated by the arrow A2.
  • the partition plate 25 as indicated by the arrow A21, the air flowing in the first path 23 travels from the upstream portion of the heating device 32 to the downstream portion of the heating device 32.
  • the air flowing in the second path 24, as indicated by the arrow A22 flows into the first path 23 via the small hole 25a.
  • the air which is supplied from the small hole 25a, is able to directly touches the heating device 32, whose surface temperature rises, to cool the heating device 32.
  • the air raised in temperature by the contact with the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by the arrow A3. According to this, the air in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the air, which is output from the outlet port 2b into the heating chamber 2, and the radiant heat from the heating device 32.
  • the ceiling portion 22 of the circulation duct 20 braches off into: the first path that is provided with the heating device 32; and the second path 24 that is provided with the small hole 25a which faces the first path 23, so that the air is suppliable from the second path 24 via the small hole 25 to a portion of the first path 23 which is locally raised to a high temperature by the heating device 32.
  • the surface temperature of the heating device 32 is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device 32.
  • the small hole 25a may be disposed at another portion of the first path 23 which is raised to a high temperature.
  • the guide plate 25b for guiding the air to the small hole 25 may be disposed.
  • Fig. 6 shows a front sectional view of a heating cooking appliance according to a third embodiment.
  • the present embodiment is different from the first embodiment in that the cooking is performed by supplying steam to the heating chamber 2 and different in disposition of the circulation duct 20.
  • the other portions are the same as the first embodiment.
  • a plurality of disposition portions 6 are disposed in a vertical direction on both side surfaces of the heating chamber 2; and a placement tray 7, on which an ingredient is placed, is disposed on the disposition portion 6. According to this, it is possible to perform the cooking with the placement trays 7 disposed vertically on a plurality of stages.
  • an opening portion (not shown), via which an air flow is able to pass, is formed through a grasp portion around the placement tray 7.
  • the inlet port 2a is opened through an upper portion of the right side surface of the heating chamber 2, while the outlet ports 2b, 2c are opened through the ceiling surface and the left side surface of the heating chamber 2, respectively.
  • the inlet port 2a is disposed above the upper-stage disposition portion 6.
  • the outlet port 2b is formed of a plurality of small holes.
  • the outlet port 2c at the side surface widely opens from a portion above the upper-stage disposition portion 6 to a portion below the lower-stage disposition portion 6.
  • the outlet port 2c may be divided vertically and disposed.
  • the inlet port 2a and the outlet port 2c are connected to each other by the circulation duct 20.
  • the air blower 31 facing the inlet port 2a is disposed in a right side portion 26 of the circulation duct 20.
  • the ceiling portion 22 of the circulation duct 20 is structured in the same way as in the first embodiment, and is divided by the partition plate 25 into the lower first path 23 and the upper second path 24.
  • the heating device 32 is disposed in the first path 23.
  • the inlet port 2c is opened through a left side portion 27 of the circulation duct 20.
  • a steam supply portion 10 is disposed at a lower portion of the right side surface of the heating chamber 2.
  • a steam generation heater 13 formed of a sheathed heater is buried in a metal container that has a water supply port 11 and an output port 12.
  • the water supply port 11 is supplied with water for steam generation from a releasable water supply tank (not shown).
  • the steam generation heater 13 vaporizes the water supplied from the water supply port 11 to generate steam.
  • the output port 12 is opened through the right side portion 26 of the circulation duct 20; and outputs the steam generated by the steam supply portion 10 into the circulation duct 20.
  • the heating device 32 is structured in the same way as in the first embodiment, and heats the steam flowing in the ceiling portion 22 of the circulation duct 20. According to this, it is possible to maintain the steam at a predetermined temperature and perform the cooking by means of saturated steam and superheated steam.
  • the heating cooking appliance 1 having the above structure, when an ingredient to be cooked is placed on the placement tray 7 and the cooking is started, water is supplied from the water supply tank (not shown) to the steam generation portion 10 via the water supply port 11.
  • the water supplied to the steam generation portion 10 is vaporized by the steam generation heater 13, whereby steam is generated.
  • the steam flowing from the output port 10 into the circulation duct 20 is supplied from the outlet port 2b into the heating chamber 2 thanks to the driving of the air blower 31.
  • the steam in the heating chamber 2 flows into the circulation duct 20 from the inlet port 2a as indicted by the arrow A1.
  • the steam flowing into the circulation duct 20 is guided from the side to the ceiling portion 22 as indicated by the arrow A2 and branched by the partition plate 25 into the first and second paths 23, 24.
  • the steam flowing in the first path 23 travels from the upstream portion of the heating device 32 to the downstream portion of the heating device 32.
  • the steam flowing in the second path 24, as indicated by the arrow A22 joins the first path 23 via the opening portion 23a (see Fig. 2 ) and is guided to the downstream portion of the heating device 32.
  • the steam raised in temperature by the contact with the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by the arrow A3. Besides, part of the steam raised in temperature by the heating device 32 flows from the ceiling portion 22 into the left side portion 27 as indicated by an arrow A4. The steam flowing into the left side portion 27 is output from the outlet port 2c into the heating chamber 2 as indicated by arrows A5, A7 and A8. The steam output from the outlet port 2c flows in the heating chamber 2 in a lateral direction as indicted by an arrow A9 and flows into the circulation duct 20 via the inlet port 2a as indicated by an arrow A10.
  • the steam in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the steam raised in temperature by the heating device 32 and the radiant heat from the heating device 32.
  • the cooking may be performed by means of the saturated steam by maintaining the steam at a temperature near 100° or may be performed by means of the superheated steam by maintaining the steam at a temperature of 100° or higher (e.g., 300° ).
  • the ceiling portion 22 of the circulation duct 20 braches off into: the first path 23 that guides the air to the upstream portion of the heating device 32; and the second path 24 that guides the gas to the downstream portion of the heating device 32 and joins the first path 23, so that it is possible to evenly cool the heating device 32 from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device 32 is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device 32. Besides, it is possible to increase electric power supplied to the heating device 32 and shorten the cooking time.
  • the cooking may be performed with hot air obtained by raising the air in temperature by means of the heating device 32; and the inlet port 2a may be formed through the rear surface of the heating chamber 2.
  • the partition plate 25 may be structured in the same way as in Fig. 3 and Fig. 5 described above.
  • the present invention is applicable to a heating cooking appliance that circulates a gas in a heating chamber to perform heating cooking.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)
  • Commercial Cooking Devices (AREA)

Abstract

Disclosed is a heating cooking appliance (1) wherein there are provided a heating chamber (2) that houses items to be cooked, a circulation duct (20) that connects together an inlet port (2a) and an outlet port (2b) both of which open into the wall surfaces of the heating chamber (2), an air blower (31) located in the circulation duct (20), and a heating device (32) located in the upper part of the heating chamber (2), and wherein gas in the heating chamber (2) is taken into the circulation duct (20) from the inlet port (2a) by driving the blower (31), then the gas temperature is raised by the heating device (32), and subsequently, the gas is blown into the heating chamber (2) from the inlet port (2b). This heating cooking appliance (1) is configured such that the circulation duct (20) is provided with first and second paths (23, 24) which branch off upstream of the heating device (32), that the first path (23) guides gas to the area upstream of the heating device (32), and that the second path (24) guides gas to the area downstream of the heating device (32), in which area of the flow of this gas joins the flow of the gas that runs through the first path (23).

Description

    Technical Field
  • The present invention relates to a heating cooking appliance that circulates a gas in a heating chamber to perform heating cooking.
    • Background Art
  • Fig. 7 is a side sectional view showing a conventional heating cooking appliance. A heating cooking appliance 1 includes a heating chamber 2 that houses an ingredient to be cooked which is placed through a front side when a door 3 is opened. An inlet port 2a opens through a rear side of the heating chamber 2, and an outlet port 2b opens through a ceiling side. The inlet port 2a and the outlet port 2b are connected to each other by a circulation duct 20 that is disposed around the heating chamber 2. An air blower 31 facing the inlet port 2a is disposed in a rear portion 21 of the circulation duct 20, and a heating device 32 is disposed in a ceiling portion 22 of the circulation duct 20.
  • Thanks to driving of the air blower 31, air in the heating chamber 2 flows into the circulation duct 20 from the inlet port 2a as indicted by an arrow A1. The air flowing into the circulation duct 20 is guided from the rear side to the ceiling portion 22 as indicated by an arrow A2 and raised in temperature by the heating device 32. The air raised in temperature by the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by an arrow A3. According to this, the air in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the air output from the outlet port 2b into the heating chamber and radiant heat from the heating device 32.
    • Citation List Patent Literature
  • PLT1: JP-A-2009-2627 (page 3 to page 10, Fig. 2)
    • Summary of Invention Technical Problem
  • However, according to the conventional heating cooking appliance 1, the air is supplied to the ceiling portion 22 of the circulation duct 20 from the rear side that is an upstream side with respect to the heating device 32. According to this, an upstream portion of the heating device 32 is easily cooled but a downstream portion of the heating device 32 is only slightly cooled, so that the downstream portion becomes higher than the upstream portion in surface temperature. Because of this, there is a problem that the surface temperature of the downstream portion of the heating device 32 is raised to a high temperature; and the life of the heating device 32 becomes short. Besides, electric power supplied to the heating device 32 is restricted by the surface temperature of the downstream portion, there is a problem that the cooking time becomes long. Here, the same problem occurs in a heating cooking appliance as well that performs cooking by supplying steam to the heating chamber 2 and maintaining the steam at a predetermined temperature by means of the heating device 32.
  • It is an object of the present invention to provide a heating cooking appliance that achieves a long life of the heating device and is able to shorten the cooking time.
    • Solution to Problem
  • To achieve the above object, a heating cooking appliance according to the present invention includes:
    • a heating chamber that houses an ingredient to be cooked;
    • a circulation duct that connects an inlet port and an outlet port, which are opened through a wall surface of the heating chamber, to each other;
    • an air blower that is disposed in the circulation duct; and
    • a heating device that is disposed in the circulation duct over the heating chamber;
    • the heating cooking appliance introduces a gas in the heating chamber from the inlet port into the circulation duct thanks to driving of the air blower; and raises the gas in temperature by means of the heating device; wherein
    • the circulation duct includes first and second paths that branch off at an upstream position with respect to the heating device;
    • the first path guides the gas to an upstream portion of the heating device; and
    • the second path guides the gas to a downstream portion of the heating device to allow the gas to join the gas that flows in the first path.
  • According to this structure, when the air blower is driven, the gas including air and steam in the heating chamber flows into the circulation duct via the inlet port. The gas flowing into the circulation duct branches off into the first and second paths and is guided to the heating device disposed over the heating chamber. Here, the second path guides the gas to the downstream portion of the heating device, while the first path guides the gas to the upstream portion of the heating device to allow the gas to join the gas flowing in the second path at the downstream portion of the heating device. The gas flowing in the first and second paths is raised in temperature by the heating device and output from the outlet port into the heating chamber. According to this, the gas in the heating chamber circulates via the circulation duct and the ingredient is cooked by the gas raised in temperature by the heating device and radiant heat from the heating device.
  • Besides, in the heating cooking appliance having the above structure according to the present invention, the second path is disposed over the first path via a partition plate. According to this structure, the gas flowing in the circulation duct is branched vertically by the partition plate and joins at the downstream portion of the heating device.
  • Besides, in the heating cooking appliance having the above structure according to the present invention, the partition plate is provided with a small hole that faces a predetermined position of an upstream portion of the first path. According to this structure, part of the gas flowing in the second path flows into the first path via the small hole.
  • Besides, in the heating cooking appliance having the above structure according to the present invention, the small hole is formed right over or substantially right over the heating device.
  • Besides, the heating cooking appliance having the above structure according to the present invention is provided with a guide plate that blocks a flow path for the gas flowing in the second path and guides the gas to the small hole.
  • Besides, a heating cooking appliance according to the present invention includes:
    • a heating chamber that houses an ingredient to be cooked;
    • a circulation duct that connects an inlet port and an outlet port, which are opened through a wall surface of the heating chamber, to each other;
    • an air blower that is disposed in the circulation duct; and
    • a heating device that is disposed in the circulation duct over the heating chamber;
    • the heating cooking appliance introduces a gas in the heating chamber from the inlet port into the circulation duct thanks to driving of the air blower; raises the gas in temperature by means of the heating device; and outputs the gas from the outlet port into the heating chamber; wherein
    • the circulation duct includes first and second paths that branch off at an upstream position with respect to the heating device and separated from each other by a partition plate;
    • the heating device is disposed in the first path; and
    • the partition plate is provided with a small hole that faces a predetermined position of the first path.
  • According to this structure, when the air blower is driven, the gas including the air and steam in the heating chamber flows into the circulation duct via the inlet port. The gas flowing into the circulation duct is branched off into the first and second paths by the partition plate; and the gas flowing in the first path is raised in temperature by the heating device disposed in the first path. Besides, the gas flowing in the second path is supplied to a predetermined position of the first path via the small hole, and raised in temperature by the heating device. The gas raised in temperature by the heating device is output from the outlet port into the heating chamber. According to this, the gas in the heating chamber circulates via the circulation duct, and the ingredient is heated and cooked by the gas raised in temperature by the heating device and the radiant heat from the heating device.
  • Besides, in the heating cooking appliance having the above structure according to the present invention, the small hole is formed right over or substantially right over the heating device.
  • Besides, the heating cooking appliance having the above structure according to the present invention is provided with a guide plate that blocks a flow path for the gas flowing in the second path and guides the gas to the small hole.
    • Advantageous Effects of Invention
  • According to the present invention, the circulation duct branches off into: the first path that guides the gas to the upstream portion of the heating deice; and the second path that guides the gas to the downstream portion of the heating device and joins the first path, so that it is possible to evenly cool the heating device from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device. Besides, it is possible to increase electric power supplied to the heating device and shorten the cooking time.
  • Besides, according to the present invention, the circulation duct braches off into: the first path that is provided with the heating device; and the second path that is provided with the small hole which faces the first path, so that the gas is suppliable from the second path via the small hole to a portion of the first path which is locally raised to a high temperature by the heating device. According to this, it is possible to evenly cool the heating device from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device. Besides, it is possible to increase electric power supplied to the heating device and shorten the cooking time.
    • Brief Description of Drawings
    • [Fig. 1] is a side sectional view showing a heating cooking appliance according to a first embodiment of the present invention.
    • [Fig. 2] is a plan view showing a ceiling portion of a circulation duct of the heating cooking appliance according to the first embodiment of the present invention.
    • [Fig. 3] is a plan view showing a partition plate of the heating cooking appliance according to the first embodiment of the present invention.
    • [Fig. 4] is a side sectional view showing a heating cooking appliance according to a second embodiment of the present invention.
    • [Fig. 5] is a plan view showing a ceiling portion of a circulation duct of the heating cooking appliance according to the second embodiment of the present invention.
    • [Fig. 6] is a front sectional view showing a heating cooking appliance according to a third embodiment of the present invention.
    • [Fig. 7] is a side sectional showing a conventional heating cooking appliance.
    Description of Embodiments
  • Hereinafter, embodiments of the present invention are described with reference to the drawings. For the sake of description, the same portions as those in the conventional example shown in Fig. 7 are indicated by the same reference numbers. Fig. 1 is a side sectional view showing a heating cooking appliance according to a first embodiment. The heating cooking appliance 1 includes the heating chamber 2 that houses an ingredient to be cooked which is placed through the front side when the door 3 is opened.
  • The inlet port 2a is opened through the rear side of the heating chamber 2, and the outlet port 2b is opened through the ceiling surface of the heating chamber 2. The inlet port 2a and the outlet port 2b are connected to each other by the circulation duct 20 that is disposed around the heating chamber 2. The air blower 31 facing the inlet port 2a is disposed in the rear portion 21 of the circulation duct 20. The ceiling portion 22 of the circulation duct 20 is divided by a partition plate 25 into a lower first path 23 and an upper second path 24. The heating device 32 is disposed in the first path 23.
  • Fig. 2 shows a plan view of the ceiling portion 22 of the circulation duct 20. In the figure, an upper portion is a rear side of the heating cooking appliance 1. The heating device 32 is formed of a tube-like sheathed heater that is supplied with electricity from a side and snakes its way. The partition plate 25 is formed of stainless steel or the like, covers an upstream portion of the heating device 32 and separates the first and second paths from each other. A downstream portion of the heating device 32 is covered by an upper plate 22a of the ceiling portion 22, and an opening portion 23a is formed in a horizontal direction between the upper plate 22a and the partition plate 25. The first path 23 and the second path 24 join each other via the opening portion 23a.
  • Thanks to driving of the air blower 31, air in the heating chamber 2 flows into the circulation duct 20 from the inlet port 2a as indicted by the arrow A1. The air flowing into the circulation duct 20 is guided from the rear side to the ceiling portion 22 as indicated by the arrow A2 and branched by the partition plate 25 into the first and second paths 23, 24. As indicated by an arrow A21, the air flowing in the first path 23 travels from the upstream portion of the heating device 32 to the downstream portion of the heating device 32. The air flowing in the second path 24, as indicated by an arrow A22, joins the first path 23 via the opening portion 23a and is guided to the downstream portion of the heating device 32.
  • The air raised in temperature by contact with the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by the arrow A3. According to this, the air in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the air, which is output from the outlet port 2b into the heating chamber 2, and the radiant heat from the heating device 32.
  • According to the present embodiment, the ceiling portion 22 of the circulation duct 20 branches off into: the first path 23 that guides the air to the upstream portion of the heating deice 32; and the second path 24 that guides a gas to the downstream portion of the heating device 32 and joins the first path 23, so that it is possible to evenly cool the heating device 32 from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device 32 is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device 32. Besides, it is possible to increase electric power supplied to the heating device 32 and shorten the cooking time.
  • Besides, the second path 24 is disposed over the first path 23 via the partition plate 25, so that it is possible to easily branch the circulation duct 20. Besides, it is possible to secure a larger flow-path area of the second path 24 than disposing the first and second paths 23, 24 in a front-rear direction, so that it is possible to surely cool the downstream portion of the heating device 32.
  • Here, as shown in Fig. 3, the partition plate 25 may be provided with a small hole 25a that has an opening area smaller than the opening portion 23a and faces a predetermined position of the upstream portion of the first path 23. The small hole 25a, as shown in the figure, is disposed, for example, at both end portions on the flow-in side of the second path 24. Part of the air flowing in the second path 24 flows into the first path 23 via the small hole 25a. According to this, it is possible to supply air from the second path 24 via the small hole 25 to a portion into which the air in the first path 23 only slightly spreads and to more evenly cool the upstream portion of the heating device 32.
  • Besides, as shown in the figure, if the partition plate 25 is provided with a guide plate 25b that guides the air to the small hole 25, it is possible to surely supply the air from the small hole 23 to the first path 23, which is more desirable. Here, the small hole 25a may be disposed right over or substantially right over the tube-like heating device 32 that snakes. According to this, the air, which is supplied from the small hole 25a, is able to directly touches the heating device 32, whose surface temperature rises, to cool the heating device 32.
  • Next, Fig. 4 shows a side sectional view of a heating cooking appliance according to a second embodiment. For the sake of description, the same portions as those shown in Fig. 1 to Fig. 3 described above are indicated by the same reference numbers. The present embodiment is different from the first embodiment in structure of the partition plate 25 of the ceiling portion 22 of the circulation duct 20. The other portions are the same as the first embodiment.
  • The entire ceiling portion 22 of the circulation duct 20 is separated by the partition plate 25 into the first and second paths 23, 24. Fig. 5 shows a plan view of the ceiling portion 22 of the circulation duct 20. The partition plate 25 covers the entire surface of the first path 23 and is provided with a plurality of the small holes 25a that face the first path 23. The small hole 25a is disposed right over or substantially right over the tube-like heating device 32.
  • Thanks to driving of the air blower 31, the air, which flows from the heating chamber 2 into the circulation duct 20 via the inlet port 2a as indicted by the arrow A1, is guided from the rear side to the ceiling portion 22 as indicated by the arrow A2. Thanks to the partition plate 25, as indicated by the arrow A21, the air flowing in the first path 23 travels from the upstream portion of the heating device 32 to the downstream portion of the heating device 32. The air flowing in the second path 24, as indicated by the arrow A22, flows into the first path 23 via the small hole 25a. Here, the air, which is supplied from the small hole 25a, is able to directly touches the heating device 32, whose surface temperature rises, to cool the heating device 32.
  • The air raised in temperature by the contact with the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by the arrow A3. According to this, the air in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the air, which is output from the outlet port 2b into the heating chamber 2, and the radiant heat from the heating device 32.
  • According to the present embodiment, the ceiling portion 22 of the circulation duct 20 braches off into: the first path that is provided with the heating device 32; and the second path 24 that is provided with the small hole 25a which faces the first path 23, so that the air is suppliable from the second path 24 via the small hole 25 to a portion of the first path 23 which is locally raised to a high temperature by the heating device 32. According to this, it is possible to evenly cool the heating device 32 from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device 32 is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device 32. Besides, it is possible to increase electric power supplied to the heating device 32 and shorten the cooking time.
  • Here, the small hole 25a may be disposed at another portion of the first path 23 which is raised to a high temperature. Here, as shown in Fig. 3 described above, the guide plate 25b for guiding the air to the small hole 25 may be disposed.
  • Next, Fig. 6 shows a front sectional view of a heating cooking appliance according to a third embodiment. For the sake of description, the same portions as those shown in Fig. 1 to Fig. 3 described above are indicated by the same reference numbers. The present embodiment is different from the first embodiment in that the cooking is performed by supplying steam to the heating chamber 2 and different in disposition of the circulation duct 20. The other portions are the same as the first embodiment.
  • A plurality of disposition portions 6 are disposed in a vertical direction on both side surfaces of the heating chamber 2; and a placement tray 7, on which an ingredient is placed, is disposed on the disposition portion 6. According to this, it is possible to perform the cooking with the placement trays 7 disposed vertically on a plurality of stages. Here, an opening portion (not shown), via which an air flow is able to pass, is formed through a grasp portion around the placement tray 7.
  • The inlet port 2a is opened through an upper portion of the right side surface of the heating chamber 2, while the outlet ports 2b, 2c are opened through the ceiling surface and the left side surface of the heating chamber 2, respectively. The inlet port 2a is disposed above the upper-stage disposition portion 6. The outlet port 2b is formed of a plurality of small holes. The outlet port 2c at the side surface widely opens from a portion above the upper-stage disposition portion 6 to a portion below the lower-stage disposition portion 6. The outlet port 2c may be divided vertically and disposed.
  • The inlet port 2a and the outlet port 2c are connected to each other by the circulation duct 20. The air blower 31 facing the inlet port 2a is disposed in a right side portion 26 of the circulation duct 20. The ceiling portion 22 of the circulation duct 20 is structured in the same way as in the first embodiment, and is divided by the partition plate 25 into the lower first path 23 and the upper second path 24. The heating device 32 is disposed in the first path 23. The inlet port 2c is opened through a left side portion 27 of the circulation duct 20.
  • A steam supply portion 10 is disposed at a lower portion of the right side surface of the heating chamber 2. In the steam supply portion 10, a steam generation heater 13 formed of a sheathed heater is buried in a metal container that has a water supply port 11 and an output port 12. The water supply port 11 is supplied with water for steam generation from a releasable water supply tank (not shown). The steam generation heater 13 vaporizes the water supplied from the water supply port 11 to generate steam. The output port 12 is opened through the right side portion 26 of the circulation duct 20; and outputs the steam generated by the steam supply portion 10 into the circulation duct 20.
  • The heating device 32 is structured in the same way as in the first embodiment, and heats the steam flowing in the ceiling portion 22 of the circulation duct 20. According to this, it is possible to maintain the steam at a predetermined temperature and perform the cooking by means of saturated steam and superheated steam.
  • In the heating cooking appliance 1 having the above structure, when an ingredient to be cooked is placed on the placement tray 7 and the cooking is started, water is supplied from the water supply tank (not shown) to the steam generation portion 10 via the water supply port 11. The water supplied to the steam generation portion 10 is vaporized by the steam generation heater 13, whereby steam is generated. The steam flowing from the output port 10 into the circulation duct 20 is supplied from the outlet port 2b into the heating chamber 2 thanks to the driving of the air blower 31.
  • Besides, thanks to the driving of the air blower 31, the steam in the heating chamber 2 flows into the circulation duct 20 from the inlet port 2a as indicted by the arrow A1. The steam flowing into the circulation duct 20 is guided from the side to the ceiling portion 22 as indicated by the arrow A2 and branched by the partition plate 25 into the first and second paths 23, 24. As indicated by the arrow A21, the steam flowing in the first path 23 travels from the upstream portion of the heating device 32 to the downstream portion of the heating device 32. The steam flowing in the second path 24, as indicated by the arrow A22, joins the first path 23 via the opening portion 23a (see Fig. 2) and is guided to the downstream portion of the heating device 32.
  • The steam raised in temperature by the contact with the heating device 32 is output from the outlet port 2b into the heating chamber 2 as indicated by the arrow A3. Besides, part of the steam raised in temperature by the heating device 32 flows from the ceiling portion 22 into the left side portion 27 as indicated by an arrow A4. The steam flowing into the left side portion 27 is output from the outlet port 2c into the heating chamber 2 as indicated by arrows A5, A7 and A8. The steam output from the outlet port 2c flows in the heating chamber 2 in a lateral direction as indicted by an arrow A9 and flows into the circulation duct 20 via the inlet port 2a as indicated by an arrow A10.
  • According to this, the steam in the heating chamber 2 circulates via the circulation duct 20, and the ingredient is heated and cooked by the steam raised in temperature by the heating device 32 and the radiant heat from the heating device 32. Here, the cooking may be performed by means of the saturated steam by maintaining the steam at a temperature near 100° or may be performed by means of the superheated steam by maintaining the steam at a temperature of 100° or higher (e.g., 300° ).
  • According to the present embodiment, like in the first embodiment, the ceiling portion 22 of the circulation duct 20 braches off into: the first path 23 that guides the air to the upstream portion of the heating device 32; and the second path 24 that guides the gas to the downstream portion of the heating device 32 and joins the first path 23, so that it is possible to evenly cool the heating device 32 from the upstream portion to the downstream portion. Accordingly, the surface temperature of the heating device 32 is maintainable at a low temperature, so that it is possible to achieve a long life of the heating device 32. Besides, it is possible to increase electric power supplied to the heating device 32 and shorten the cooking time.
  • In the present embodiment, like in the first and second embodiments, the cooking may be performed with hot air obtained by raising the air in temperature by means of the heating device 32; and the inlet port 2a may be formed through the rear surface of the heating chamber 2. Besides, the partition plate 25 may be structured in the same way as in Fig. 3 and Fig. 5 described above.
    • Industrial Applicability
  • The present invention is applicable to a heating cooking appliance that circulates a gas in a heating chamber to perform heating cooking.
    • Reference Signs List
    • 1
    heating cooking appliance
    2
    heating chamber
    2a
    inlet port
    2b, 2c
    outlet port
    3
    door
    6
    disposition portion
    7
    placement tray
    10
    steam supply portion
    11
    water supply port
    12
    output port
    13
    steam generation heater
    20
    circulation duct
    21
    rear portion
    22
    ceiling portion
    23
    first path
    24
    second path
    25
    partition plate
    25a
    small hole
    25b
    guide portion
    26
    right side portion
    27
    left side portion
    31
    air blower
    32
    heating device

Claims (8)

  1. A heating cooking appliance comprising:
    a heating chamber that houses an ingredient to be cooked;
    a circulation duct that connects an inlet port and an outlet port, which are opened through a wall surface of the heating chamber, to each other;
    an air blower that is disposed in the circulation duct; and
    a heating device that is disposed in the circulation duct over the heating chamber;
    the heating cooking appliance introduces a gas in the heating chamber from the inlet port into the circulation duct thanks to driving of the air blower; and raises the gas in temperature by means of the heating device; wherein
    the circulation duct includes first and second paths that branch off at an upstream position with respect to the heating device;
    the first path guides the gas to an upstream portion of the heating device; and
    the second path guides the gas to a downstream portion of the heating device to allow the gas to join the gas that flows in the first path.
  2. The heating cooking appliance according to claim 1, wherein the second path is disposed over the first path via a partition plate.
  3. The heating cooking appliance according to claim 2, wherein the partition plate is provided with a small hole that faces a predetermined position of an upstream portion of the first path.
  4. The heating cooking appliance according to claim 3, wherein the small hole is formed right over or substantially right over the heating device.
  5. The heating cooking appliance according to claim 4, further comprising a guide plate that blocks a flow path for the gas flowing in the second path and guides the gas to the small hole.
  6. A heating cooking appliance comprising:
    a heating chamber that houses an ingredient to be cooked;
    a circulation duct that connects an inlet port and an outlet port, which are opened through a wall surface of the heating chamber, to each other;
    an air blower that is disposed in the circulation duct; and
    a heating device that is disposed in the circulation duct over the heating chamber;
    the heating cooking appliance introduces a gas in the heating chamber from the inlet port into the circulation duct thanks to driving of the air blower; raises the gas in temperature by means of the heating device; and outputs the gas from the outlet port into the heating chamber; wherein
    the circulation duct includes first and second paths that branch off at an upstream position with respect to the heating device and separated from each other by a partition plate;
    the heating device is disposed in the first path; and
    the partition plate is provided with a small hole that faces a predetermined position of the first path.
  7. The heating cooking appliance according to claim 6, wherein the small hole is formed right over or substantially right over the heating device.
  8. The heating cooking appliance according to claim 7, further comprising a guide plate that blocks a flow path for the gas that flows in the second path and guides the gas to the small hole.
EP10794222.9A 2009-07-03 2010-07-01 Heating cooking appliance Withdrawn EP2450631A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009158533 2009-07-03
PCT/JP2010/061243 WO2011002054A1 (en) 2009-07-03 2010-07-01 Heating cooking appliance

Publications (2)

Publication Number Publication Date
EP2450631A1 true EP2450631A1 (en) 2012-05-09
EP2450631A4 EP2450631A4 (en) 2017-12-13

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US (1) US8614408B2 (en)
EP (1) EP2450631A4 (en)
JP (1) JP5307893B2 (en)
CN (1) CN102472497B (en)
WO (1) WO2011002054A1 (en)

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Also Published As

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EP2450631A4 (en) 2017-12-13
US8614408B2 (en) 2013-12-24
CN102472497A (en) 2012-05-23
JP5307893B2 (en) 2013-10-02
CN102472497B (en) 2015-06-24
US20120074124A1 (en) 2012-03-29
JPWO2011002054A1 (en) 2012-12-13
WO2011002054A1 (en) 2011-01-06

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